How to clean screw bolts?

A screw bolt is a metal object similar to a nail, with a raised spiral line around it. You turn a screw bolt using a screwdriver so that it goes through two things and fastens them together.

• What are the failures of screw bolts?

• How to maintain screw bolts?

• How to clean screw bolts?

What are the failures of screw bolts?

The blackening of screw bolts is generally due to the high heat generated during cold heading or tooth rubbing. It occurs in the cross-groove part. During the production process, the supply of lubricating oil can end the heat relaxation in time. The speed of the machine can also be appropriately lowered to prevent the occurrence of problems. In addition to technical reasons, the blackening of screw bolts may also be caused by the material.

As the constant use of the machines, the screw bolts can be easily loose. In order to prevent spontaneous loosening, it is necessary to eliminate the sliding between the connected parts.

The attachment of dust or heterogeneous metal particles and the condensed water of the screw bolt form a micro battery, triggering an electrochemical reaction. The protective film is damaged. The surface of screw bolts adheres to the organic juice, which forms organic acid that will corrode the metal surface.

Sometimes, screw bolts are often seen cracking. The quality of the materials selected for the screw bolts is problematic. There are process problems in producing screw bolts. In addition, there is too much force used on screw bolts.

How to maintain screw bolts?

Screw bolts need to be cleaned with silicate cleaning agent after quenching and then rinsed. Be careful when rinsing to prevent residues.

The screw bolts will show signs of discoloration after tempering. There may be oily residues after soaking in ether, indicating that the surface of them is not clean. It is indicated that the screw bolts are unreasonably stacked when heated, which leads to slight oxidation in the quenching oil.

There is a white residue on the high-strength screw bolts, which was confirmed to be phosphide. Because the acid washer was not cleaned and the rinse tank was not thoroughly inspected.

The surface alkalis cannot be removed in the quenching oil of screw bolts, which will burn the surface at high temperatures and increase the damage during tempering. It is recommended to thoroughly clean and rinse them before heat treatment completely removes the alkaline residues.

How to clean screw bolts?

There are two main cleaning processes in the screw bolts. Cleaning them before heat treatment, which mainly cleans the remaining cooling oil, coolant and anti-rust liquid in the previous process. The other is cleaning after heat treatment, mainly cleaning and quenching after the residual quenching oil.

Dip cleaning in which cleaning fluid is added to the cleaning tank and the screw bolts to be cleaned are immersed in it. however, the cleaning ability is weak and it takes a long time.

Air jet cleaning is to install a jet nozzle in the cleaning tank. Use gas to spray the cleaning liquid onto the surface of the screw bolts to be cleaned.

Jet cleaning uses the cleaning liquid sprayed in the liquid phase from the side of the tank. The agitation of the cleaning liquid promotes washing, which ability is stronger than that of immersion washing.

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